Welcome

I have started Developing Web Portal for my university final year project. I'm pretty newbie with the backend of website for front end i have used bootstrap, css, html, jquery and PHP for backhand development.
Today its 26/1/2015 and have made a front end of sigin/signup page.

So i made my front end in 5 hours there was not any complexity i winded up the front end in a day, i was planning to make my login page look like a list with options of "TEACHER", "STUDENT"and  "ADMIN" login and when user click on the TEACHER a drop down should show up with fields of 'username' and 'password' with a check box of  'remember me' functionality so that a session should store in cookies, its all back end stuff i'll explain later in my posts what do these things do, For now this purpose i used JQUERY function it was so easy to use i just have to write some line of code
"
   $(document).ready(function(){
$("#teach_signin").hide();

$("#teachclick").click(function(){
$("#teach_signin").show(1000);
$("#student_signin").hide(1000);
$("#admin_signin").hide(1000);
});

});
"
so by this functionality user is able to see after clicking the required fields.  i enjoyed playing with jquery it was fun that when user click the other name from the list the previous one(if opened) auto goes to function hide and look/feel of website is increased. Obviously there was a register/signup option as well for those who are new to my site, this was what i did in one day.
 then started developing back end from 27/1/2015 .
I encounter many problems on the back end as i have